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<div class="title">nrf51/Board/nrf6310/debouncer_example/main.c</div>  </div>
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<a href="nrf6310_2debouncer__example_2main_8c.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/* Copyright (c) 2009 Nordic Semiconductor. All Rights Reserved.</span>
<a name="l00002"></a>00002 <span class="comment"> *</span>
<a name="l00003"></a>00003 <span class="comment"> * The information contained herein is confidential property of Nordic</span>
<a name="l00004"></a>00004 <span class="comment"> * Semiconductor ASA.Terms and conditions of usage are described in detail</span>
<a name="l00005"></a>00005 <span class="comment"> * in NORDIC SEMICONDUCTOR STANDARD SOFTWARE LICENSE AGREEMENT.</span>
<a name="l00006"></a>00006 <span class="comment"> *</span>
<a name="l00007"></a>00007 <span class="comment"> * Licensees are granted free, non-transferable use of the information. NO</span>
<a name="l00008"></a>00008 <span class="comment"> * WARRANTY of ANY KIND is provided. This heading must NOT be removed from</span>
<a name="l00009"></a>00009 <span class="comment"> * the file.</span>
<a name="l00010"></a>00010 <span class="comment"> *</span>
<a name="l00011"></a>00011 <span class="comment"> */</span>
<a name="l00012"></a>00012 
<a name="l00024"></a>00024 <span class="preprocessor">#include &lt;stdbool.h&gt;</span>
<a name="l00025"></a>00025 <span class="preprocessor">#include &lt;stdint.h&gt;</span>
<a name="l00026"></a>00026 <span class="preprocessor">#include &quot;nrf.h&quot;</span>
<a name="l00027"></a>00027 <span class="preprocessor">#include &quot;nrf_gpio.h&quot;</span>
<a name="l00028"></a>00028 <span class="preprocessor">#include &quot;lib_debounce.h&quot;</span>
<a name="l00029"></a>00029 
<a name="l00030"></a><a class="code" href="group__debouncer__example.html#ga17cea4a999ebdae31473f0d7fe9ed1f3">00030</a> <span class="preprocessor">#define DEBOUNCE_TIME_IN_MS (50U) //!&lt; Debounce timer in milliseconds</span>
<a name="l00031"></a><a class="code" href="group__debouncer__example.html#gaf53454acf2798331622dabf5c62e677f">00031</a> <span class="preprocessor"></span><span class="preprocessor">#define DEBOUNCE_INPUT_SAMPLING_FREQ (60U) //!&lt; Input sampling frequency in Hertz</span>
<a name="l00032"></a>00032 <span class="preprocessor"></span>
<a name="l00033"></a><a class="code" href="group__debouncer__example.html#ga747c4d9ce46cbb1df94436ed5e5bb749">00033</a> <span class="preprocessor">#define TIMER0_PRESCALER (9UL) </span>
<a name="l00034"></a><a class="code" href="group__debouncer__example.html#ga5040eaf7cc2530fd7801a1c72552767a">00034</a> <span class="preprocessor">#define TIMER0_CLOCK (SystemCoreClock &gt;&gt; TIMER0_PRESCALER) </span>
<a name="l00036"></a><a class="code" href="group__debouncer__example.html#gade0ac7f737311be0e76142d713a6f3da">00036</a> <span class="preprocessor">#define MS_TO_TIMER0_TICKS(ms) ((1000000UL * ms) / (TIMER0_CLOCK)) </span>
<a name="l00038"></a><a class="code" href="group__debouncer__example.html#ga8bb0c7f312bb8665c3377a061dae552c">00038</a> <span class="preprocessor">#define MAX_BUTTONS (8U) </span>
<a name="l00040"></a><a class="code" href="group__debouncer__example.html#ga795c8489e6b86dbbdeb0ad800e9bc48a">00040</a> <span class="preprocessor">static uint_fast16_t timer0_cc0_period; </span>
<a name="l00041"></a><a class="code" href="group__debouncer__example.html#ga904201e2b12ea5a8feacc85a67d33832">00041</a> <span class="preprocessor">static deb_t button[MAX_BUTTONS]; </span>
<a name="l00045"></a>00045 <span class="preprocessor">static void timer0_init(void);</span>
<a name="l00046"></a>00046 <span class="preprocessor"></span>
<a name="l00049"></a><a class="code" href="group__debouncer__example.html#ga5f89e5f7418d3a10f49b2faeab3711dd">00049</a> <span class="keywordtype">void</span> <a class="code" href="group__debouncer__example.html#ga5f89e5f7418d3a10f49b2faeab3711dd">TIMER0_IRQHandler</a>(<span class="keywordtype">void</span>)
<a name="l00050"></a>00050 {
<a name="l00051"></a>00051   <span class="keywordflow">if</span> ((NRF_TIMER0-&gt;EVENTS_COMPARE[0] != 0) &amp;&amp; ((NRF_TIMER0-&gt;INTENSET &amp; TIMER_INTENSET_COMPARE0_Msk) != 0))
<a name="l00052"></a>00052   {
<a name="l00053"></a>00053     NRF_TIMER0-&gt;EVENTS_COMPARE[0] = 0;
<a name="l00054"></a>00054     NRF_TIMER0-&gt;CC[0] += <a class="code" href="group__debouncer__example.html#ga795c8489e6b86dbbdeb0ad800e9bc48a">timer0_cc0_period</a>;
<a name="l00055"></a>00055     <span class="keywordflow">for</span> (uint_fast8_t button_index=0; button_index &lt; <a class="code" href="group__debouncer__example.html#ga8bb0c7f312bb8665c3377a061dae552c">MAX_BUTTONS</a>; button_index++)
<a name="l00056"></a>00056     {
<a name="l00057"></a>00057       debounce(<a class="code" href="group__nrf__gpio.html#ga0983906029818d8aa199b71b578d1c12" title="Read the input level of a GPIO pin.">nrf_gpio_pin_read</a>(button_index), &amp;<a class="code" href="group__debouncer__example.html#ga904201e2b12ea5a8feacc85a67d33832">button</a>[button_index]);
<a name="l00058"></a>00058     }
<a name="l00059"></a>00059   }
<a name="l00060"></a>00060 }
<a name="l00061"></a>00061 
<a name="l00062"></a><a class="code" href="group__debouncer__example.html#gadd186346e02f7413d2fa6e72fe5f9562">00062</a> <span class="keyword">static</span> <span class="keywordtype">void</span> <a class="code" href="group__debouncer__example.html#gadd186346e02f7413d2fa6e72fe5f9562">timer0_init</a>(<span class="keywordtype">void</span>)
<a name="l00063"></a>00063 {
<a name="l00064"></a>00064   <span class="comment">// Power on the TIMER0 peripheral</span>
<a name="l00065"></a>00065   NRF_POWER-&gt;PERPOWER |= (POWER_PERPOWER_TIMER0_Power &lt;&lt; POWER_PERPOWER_TIMER0_Pos);
<a name="l00066"></a>00066 
<a name="l00067"></a>00067   <span class="comment">// Wait for the power up</span>
<a name="l00068"></a>00068   <span class="keywordflow">while</span> ((NRF_POWER-&gt;PERRDY &amp; POWER_PERRDY_TIMER0_Msk) != (POWER_PERRDY_TIMER0_Ready &lt;&lt; POWER_PERRDY_TIMER0_Pos))
<a name="l00069"></a>00069   {
<a name="l00070"></a>00070   }
<a name="l00071"></a>00071 
<a name="l00072"></a>00072   NRF_TIMER0-&gt;MODE = TIMER_MODE_MODE_Timer; <span class="comment">// Set the timer in Timer Mode</span>
<a name="l00073"></a>00073   NRF_TIMER0-&gt;PRESCALER = <a class="code" href="group__debouncer__example.html#ga747c4d9ce46cbb1df94436ed5e5bb749">TIMER0_PRESCALER</a>;
<a name="l00074"></a>00074 
<a name="l00075"></a>00075   <span class="comment">// Enable interrupt for COMPARE[0]</span>
<a name="l00076"></a>00076   NRF_TIMER0-&gt;INTENSET = (1UL &lt;&lt; TIMER_INTENSET_COMPARE0_Pos);
<a name="l00077"></a>00077   NRF_TIMER0-&gt;CC[0] = <a class="code" href="group__debouncer__example.html#ga795c8489e6b86dbbdeb0ad800e9bc48a">timer0_cc0_period</a>;
<a name="l00078"></a>00078   NRF_TIMER0-&gt;TASKS_START = 1; <span class="comment">// Start clocks</span>
<a name="l00079"></a>00079 }
<a name="l00080"></a>00080 
<a name="l00081"></a>00081 
<a name="l00086"></a><a class="code" href="group__debouncer__example.html#ga840291bc02cba5474a4cb46a9b9566fe">00086</a> <span class="keywordtype">int</span> <a class="code" href="group__gpio__example.html#ga840291bc02cba5474a4cb46a9b9566fe">main</a>(<span class="keywordtype">void</span>)
<a name="l00087"></a>00087 {
<a name="l00088"></a>00088   <span class="comment">// DEBOUNCE_INPUT_SAMPLING_FREQ is in hertz so we need to multiply by 1000 to get milliseconds</span>
<a name="l00089"></a>00089   <a class="code" href="group__debouncer__example.html#ga795c8489e6b86dbbdeb0ad800e9bc48a">timer0_cc0_period</a> = <a class="code" href="group__debouncer__example.html#gade0ac7f737311be0e76142d713a6f3da">MS_TO_TIMER0_TICKS</a>((1000 * 1 / <a class="code" href="group__debouncer__example.html#gaf53454acf2798331622dabf5c62e677f" title="Input sampling frequency in Hertz.">DEBOUNCE_INPUT_SAMPLING_FREQ</a>));
<a name="l00090"></a>00090   <a class="code" href="group__debouncer__example.html#gadd186346e02f7413d2fa6e72fe5f9562">timer0_init</a>();
<a name="l00091"></a>00091 
<a name="l00092"></a>00092   NVIC_EnableIRQ(TIMER0_IRQn); <span class="comment">// Enable Interrupt for the timer in the core</span>
<a name="l00093"></a>00093   __enable_irq();
<a name="l00094"></a>00094 
<a name="l00095"></a>00095   <span class="comment">// Configure pins 0-7 as inputs</span>
<a name="l00096"></a>00096   <a class="code" href="group__nrf__gpio.html#ga6d5c4a1b82ed45f7972aea6572e085f5" title="Configure GPIO pin range as inputs with given initial value set, hiding inner details. This function can be used to configure pin range as simple input.">nrf_gpio_range_cfg_input</a>(0, 7, <a class="code" href="group__nrf__gpio.html#gga07e0c8c0b30499cf0a7b79dbe62d3fcca13ffcb94eb78be866c66b5f5b516af65" title="Pin pullup resistor disabled.">NRF_GPIO_PIN_NOPULL</a>);
<a name="l00097"></a>00097 
<a name="l00098"></a>00098   <span class="comment">// Configure pins 8-15 as outputs</span>
<a name="l00099"></a>00099   <a class="code" href="group__nrf__gpio.html#ga08c820bf0360c7406b64ddaf3bfc7222" title="Configure GPIO pin range as outputs with normal drive strength. This function can be used to configur...">nrf_gpio_range_cfg_output</a>(8, 15);
<a name="l00100"></a>00100 
<a name="l00101"></a>00101   NRF_GPIO-&gt;OUT = 0UL;
<a name="l00102"></a>00102 
<a name="l00103"></a>00103   <span class="keywordflow">for</span> (uint_fast8_t button_index=0; button_index &lt; <a class="code" href="group__debouncer__example.html#ga8bb0c7f312bb8665c3377a061dae552c">MAX_BUTTONS</a>; button_index++)
<a name="l00104"></a>00104   {
<a name="l00105"></a>00105     debounce_init(&amp;<a class="code" href="group__debouncer__example.html#ga904201e2b12ea5a8feacc85a67d33832">button</a>[button_index], <a class="code" href="group__debouncer__example.html#ga17cea4a999ebdae31473f0d7fe9ed1f3" title="Debounce timer in milliseconds.">DEBOUNCE_TIME_IN_MS</a>, <a class="code" href="group__debouncer__example.html#gaf53454acf2798331622dabf5c62e677f" title="Input sampling frequency in Hertz.">DEBOUNCE_INPUT_SAMPLING_FREQ</a>);
<a name="l00106"></a>00106   }
<a name="l00107"></a>00107 
<a name="l00108"></a>00108   <span class="keywordflow">while</span> (<span class="keyword">true</span>)
<a name="l00109"></a>00109   {
<a name="l00110"></a>00110     <span class="keywordflow">for</span> (uint_fast8_t button_index=0; button_index &lt; <a class="code" href="group__debouncer__example.html#ga8bb0c7f312bb8665c3377a061dae552c">MAX_BUTTONS</a>; button_index++)
<a name="l00111"></a>00111     {
<a name="l00112"></a>00112       <span class="comment">// 8+ to map buttons to LEDs</span>
<a name="l00113"></a>00113       <a class="code" href="group__nrf__gpio.html#ga7fefa8a71e25eeb57b5b4230b0dd0484" title="Write value to GPIO pin.">nrf_gpio_pin_write</a>(8+button_index, !<a class="code" href="group__debouncer__example.html#ga904201e2b12ea5a8feacc85a67d33832">button</a>[button_index].output_state);
<a name="l00114"></a>00114     }
<a name="l00115"></a>00115   }
<a name="l00116"></a>00116 }
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